1. After placing the files into the addons folder go onto Blender and go to User Preferences (CTRL+ALT+U)
2. A new window will show and there is a button at the bottom with the text "Install Add-On.." click that.
3. Go to the folder which has your file in it and double click it. My file is 253 KB, yous should be a similar size.
4. I think afterwards you might see something like this appear in your Import-Export tab. You just need to tick that little box.
5. The last thing is to click the "Save As Default" button after its ticked, when your done restart the program.
I think thats all there is too it. To see if it worked go to File>>Export and you should see this there...
Hope this helped DarkForce